fixes #25007 - fix medium providers for plugins

Katello doesn't have medium set, since the medium is being provided
through the medium provider. This makes @medium_provider not load
and result in empty @kernel and @initrd in pxe templates.

Fixes #23445, #21566, #23448 - Refactor Layout to PF

Fixes #25102 - introduce template inputs

This adds the formal template inputs to all templates. It's heavily
based on current implementation from remote execution plugin.

Fixes #24259 - Add canned admin role

Fixes #19790 - Fix Layout/SpaceBeforeBlockBraces cop

Fixes #22611 - Adapt DB migrations for Rails 5.2

Fixes #24619 - handle Rails env in db:create

This is a change needed for migration to Rails 5.2

Fixes #24371 - Improve plugin webpack detection

Fixes #24132, #24315 - fix breadcrumbs index links

fixes #10521 - reporting templates